Improvement in sawing-machines



@sind (time renne. SMITH, or CHICAGO, iiiLiNois.

Letters Patent No. 109,351, dated November 15, 1870.

IMPRVEMENT IN SAWlNG-MACHINES.

The Schedulevrel'me to in these Letton: Ptenl: ma making part of the name.

I, Feen. D. SMITH, of Chicago; in the county of Cook and State of Illinois, have invented certain Improvements in Wood-Sewing Machines, of which the following is a. specification.

My invention relates to a 'gig or whip-sew, such ns is used for sawing scroll-work, driven by e foot-' needle worked by the operator, or drivenby :my desired power; and i It consists, particularly, in o. novel mechanism to convey au accelerated mot-ion from the treadle or driving-shaft to the sew.V

In the eccompnnyingdmwiug, which, together with the letters end-figures ot' reference marked thereon, forms partof this speeicatiou- Figure 1 represents :i side elevation of my machine, a. portion of the frame-work being out away.

Figure 2 represents an .end or front elevation oi' same.

(.l'eeeral Description.

This rod is pivoted at the other end to the lever Y 1" of the pair 'of toggle-jointed levers 11 F.

The lever F is "pirated to n bearing,f, upon the cross-beam g of the flume A, and is connected at the togglegoint G t0 the lever F'.

This lever F' is in turn pivoted rto the lower one H of the parallel vibrating levers H H'.

These levers H H' :ire connected 'at one end hy the strep h, which may be of leather, metal, or other suit- -oble material. f v

Beneath the strap Il, and between the seidv strap nud the top of the lever H', is placed on elastic cushion, of rubber or similar substance, i.

At the other end of the levers H H' is attached the vertical whip or.,gigso.w J, secured by any ordinary contrivancc to the levers, and connecting them.

The seid sew posses through an aperture in the sewing-table B, usclenrly shown in tig. 1

l( 'is en ordinary foot-treadle, communicating, by means of the rod l', motion to the rod E and iiywhecl C.

Lis a crunk, attached 'to the outer end of the i shaft c, tu he worked bythe hand of the operator,

when desired. In place of this crank a bend-wheel moy be employed when 'it is desired to use other than manpower.

The operation of my machine will be as follows: The power is applied, say, and actnates the shaft c and balance-wheel C.

The crank-wheel D communicates :t reciprocating motion to the horizontal rod E, by mea-ns ot' which the toggle-jointed levers F F are swung back and fort-ll, communicating an accelerated motion to the parallel vibrating levers H H', and thence to the saw.

Owing to this peculiar mechanical combination the levers H ll'vvibrate twice at each revolution of the crank-wheel D, and this accelerated motion isacquired in nu extremely simple manner, and with very slight loss byfrietion, thus avoiding complex and disadvantageons gearing.

Iutricete and dlicuit scroll-work may be sawn by my machine with case. Y

When foot-power is used no time is lost in stopping the saw by throwing machinery out; of gear, to change the saw from one aperture to another, and the speed may be readily and promptly governed.

'.lhe purpose of the elastic cushion i is to preserve A an equal and steady strain upon the sew.

It is obvious that when the levers H H' are swung either up or down to the extent of their vibrzition, the vertical distance between the outer extremities of' the said levers is slightly increased, the minimum distnnce being when the seid levers stand at right ongles to a. line drawn through the center of their axes or pivots, supposing them always to remain parallel. The elastic cushion allows this variation without stmining the sew.

The saw muy he changed from one aperture to auotherin sewing scroll-work, by loosening it from its attachment to the upper level` H', when the said lever' may be readily nplifted upon its pivot out of theway. The crank-wheel D is slotted at al, and -the lower toggle-jointed lever F lsgalso made with n vertical slot, so that the connecting-rod E maybe adjusted at different point-s. y l

y .,Olaim. HovingV thus fully described the construction and operation of my invention;

What I cla-im as new, end desire to secure by Let ters Potent, is

The combiuationfin sewing-machine, of the par- 3h81 Vibrating levol H Hnconneetcd by the strap h,

the toggle-jointcd levers F F', rod E, balance-wheel vO, and crank-wheel D, substantially as and for the purpose speoiiied.

l FRED. I). SMITH.` Witnesses: J. W. Mummy,

J. H. IRWIN. 

